Table 1. The basic characteristics of mahjong players and non-players.

Demographic profiles	Non-mahjong players (n=20)	Mahjong players (n=21)
Age (years)	64.3 ± 5.4	65.9 ± 6.7
Dominant arm length (cm)	69.4 ± 2.8	69.4 ± 4.9
Non-dominant arm length (cm)	69.1 ± 2.8	69.1 ± 4.7
Gender (M/F)	6/14	5/16
MMSE scores	27.4 ± 1.9	28.3 ± 1.9
Physical activity level
Light <4 METs (n)	6	7
Moderate 4–5.5 METs (n)	10	12
Heavy >5.5 METs (n)	4	2

Data are presented as the mean ± SD. MMSE: the Mini-Mental Status Examination; MET: metabolic equivalent; SD: standard deviation